Three weeks ago, I had my transmission failed and replaced with a brand new one. Five to ten days after that it began to produce an issue of after warming the car up to temp and then driving around for thirty to sixty minutes it would idle rough, and cause vibrations that you could feel all the way up into the driver seat at its worst. No check engine lights.
Things that were done to solve / narrow it down;
-air filter changed.
-Mass Air Flow sensor cleaned with CNC Sensor Kleen.
-Cleaned the throttle body butterfly (TB is three months old).
-Ran 2 different brands of injector cleaner through it.
-Took out the one year old ACDelco platinum plugs that looked sooty around
the outer ring.
-Put the stock NGK iridium plugs in that came with the car.
Eventually brought it to the local dealer, who I told they had to warm the car up, drive for thirty to sixty minutes to produce the symptoms. They didno t want to do that because they need their techs during the day. So they looked at it anyway because I suggested it could be the PCV valve built into the valve cover being stuck open or something like that. They vacuum tested it and said its working fine and they could not find the problem. They suggested doing a clean of the injectors and such with their stronger cleaner as well as doing a bore clean. So they did all that, handed it back to me and said to put in my new plugs I mentioned I had but had not put in yet and that they highly doubt it would continue with the problem.
Ran some errands after work that day and the problem still occurred, no-change. Brought it back, they did not quite know what it could be, said to put my new plugs in; drive it for the weekend and see how it goes. If it still continues they would try to organize a ride along with a laptop plugged into it some evening. So I left and got one km down the road before something went wrong; Heavy misfiring, check engine light was flashing, stabilitrak turned off light came on. Limped it back and gave it to them. Called me the next day and said it was the coil pack and the number one cylinder plug had fouled. So gave them my new plugs and they replaced the coil pack.
Out for a drive again yesterday and the problem arises again after about forty five minutes. Pull up to a stop light and a vibration/rough idle begins at idle rpm of about 700 to 800 rpm until you get moving then its fine. You can also put it in park or neutral and it will still do it at this time too. If you start it from cold and warm it up and drive just a short period of time you will not have it occur and it will purr like a kitten but if you warm it up, drive it thirty to sixty minutes it begins. Still fighting with the dealership over it and they don't really seem like they know or wanna help. So taking a shot in the dark here on the kindness of strangers to help me out here. They have already have charged me $700.00 plus in repairs that have not fixed the problem. So please, if you might have an idea as to what the problem could be any information may aid my situation.
have the same problem?
Monday, June 5th, 2017 AT 12:38 PM